What are the first, middle and second volumes of Sun Tzu's Art of War?

Sun Tzu's Art of War is divided into three volumes: upper, middle and lower. The first volume includes Ji pian, Zhan Ji pian, mou feng pian and xing pian. The middle book includes potential articles, real articles, military articles, nine-shaped articles and marching articles. The second volume includes topography, nine places, fire attack and usage.